That's how life works. Human beings are much more fragile than they think. But it would be impossible to get through life if you were always aware of the possible ways you might die at any given moment. People usually end up being too taken by everyday issues to think about these possibilities and we go through life like that.
It's a true fact but there is no point thinking about it; we do not take it less seriously, we forget about it since there is nothing we can do.